Due the international financial situation, some economists have proposed to go back to the gold standard: unfortunately, the limits of gold standard, as well as of the previous silver or bimetallic standard were that supply of money could have been limited by the availability of gold or silver.
Gabriel Ardant (Histoire financière de l’antiquité à nos jours, 1976) has proposed a composed money, whose unit should have been composed by gold, silver, copper and fixed quantities of other commodities, recently it has been brought forward, by a former NASA scientist whose name is Rivero, the idea to define the value of the money with reference to energy (to be more precise to put the monetary unit equal to 1 kWh of electrical energy), an “energy standard” or “electrical standard” that seems to be pure utopianism, however seems to be worthy to think on it.